interface PrintFunction {
    extendOptions: Function
    getStyle: Function
    setDomHeight: Function
    toPrint: Function
}

const Print = function (dom, options?: object): PrintFunction {
    options = options || {}
    // @ts-expect-error
    if (!(this instanceof Print)) return new Print(dom, options)
    this.conf = {
        styleStr: '',
        // Elements that need to dynamically get and set the height
        setDomHeightArr: [],
        // Echart dom List
        echartDomArr: [],
        // Callback before printing
        printBeforeFn: null,
        // Callback after printing
        printDoneCallBack: null
    }
    for (const key in this.conf) {
        // eslint-disable-next-line no-prototype-builtins
        if (key && options.hasOwnProperty(key)) {
            this.conf[key] = options[key]
        }
    }
    if (typeof dom === 'string') {
        this.dom = document.querySelector(dom)
    } else {
        this.dom = this.isDOM(dom) ? dom : dom.$el
    }
    if (this.conf.setDomHeightArr && this.conf.setDomHeightArr.length) {
        this.setDomHeight(this.conf.setDomHeightArr)
    }
    this.init()
}

Print.prototype = {
    /**
     * init
     */
    init: function (): void {
        const content = this.getStyle() + this.getHtml()
        this.writeIframe(content)
    },
    /**
     * Configuration property extension
     * @param {Object} obj
     * @param {Object} obj2
     */
    extendOptions: function <T>(obj, obj2: T): T {
        for (const k in obj2) {
            obj[k] = obj2[k]
        }
        return obj
    },
    /**
    Copy all styles of the original page
  */
    getStyle: function (): string {
        let str = ''
        const styles: NodeListOf<Element> = document.querySelectorAll('style,link')
        for (let i = 0; i < styles.length; i++) {
            str += styles[i].outerHTML
        }
        str += `<style>.no-print{display:none;}${this.conf.styleStr}</style>`
        return str
    },
    // form assignment
    getHtml: function (): Element {
        const inputs = document.querySelectorAll('input')
        const selects = document.querySelectorAll('select')
        const textareas = document.querySelectorAll('textarea')
        for (let k = 0; k < inputs.length; k++) {
            if (inputs[k].type == 'checkbox' || inputs[k].type == 'radio') {
                if (inputs[k].checked == true) {
                    inputs[k].setAttribute('checked', 'checked')
                } else {
                    inputs[k].removeAttribute('checked')
                }
            } else if (inputs[k].type == 'text') {
                inputs[k].setAttribute('value', inputs[k].value)
            } else {
                inputs[k].setAttribute('value', inputs[k].value)
            }
        }

        for (let k2 = 0; k2 < textareas.length; k2++) {
            if (textareas[k2].type == 'textarea') {
                textareas[k2].innerHTML = textareas[k2].value
            }
        }

        for (let k3 = 0; k3 < selects.length; k3++) {
            if (selects[k3].type == 'select-one') {
                const child = selects[k3].children
                for (const i in child) {
                    if (child[i].tagName == 'OPTION') {
                        // @ts-ignore
                        if (child[i].selected == true) {
                            child[i].setAttribute('selected', 'selected')
                        } else {
                            child[i].removeAttribute('selected')
                        }
                    }
                }
            }
        }

        return this.dom.outerHTML
    },
    /**
    create iframe
  */
    writeIframe: function (content) {
        let w: Document | Window
        let doc: Document
        const iframe: HTMLIFrameElement = document.createElement('iframe')
        const f: HTMLIFrameElement = document.body.appendChild(iframe)
        iframe.id = 'myIframe'
        iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;')
        // eslint-disable-next-line prefer-const
        w = f.contentWindow || f.contentDocument
        // eslint-disable-next-line prefer-const
        doc = f.contentDocument || f.contentWindow.document
        doc.open()
        doc.write(content)
        doc.close()
        // eslint-disable-next-line @typescript-eslint/no-this-alias
        const _this = this
        iframe.onload = function (): void {
            // Before popping, callback
            if (_this.conf.printBeforeFn) {
                _this.conf.printBeforeFn({ doc })
            }

            _this.drawEchartImg(doc).then(() => {
                _this.toPrint(w)
                setTimeout(function () {
                    document.body.removeChild(iframe)
                    // After popup, callback
                    if (_this.conf.printDoneCallBack) {
                        _this.conf.printDoneCallBack()
                    }
                }, 100)
            })
        }
    },
    /**
     * echarts printing
     * @param {Object} doc iframe window
     */
    drawEchartImg(doc): Promise<void> {
        return new Promise<void>((resolve) => {
            if (this.conf.echartDomArr && this.conf.echartDomArr.length > 0) {
                this.conf.echartDomArr.forEach((e) => {
                    const dom = doc.querySelector('#' + e.$el.id)
                    const img = new Image()
                    const w = dom.offsetWidth + 'px'
                    const H = dom.offsetHeight + 'px'

                    img.style.width = w
                    img.style.height = H
                    img.src = e.imgSrc
                    dom.innerHTML = ''
                    dom.appendChild(img)
                })
            }
            resolve()
        })
    },
    /**
    Print
  */
    toPrint: function (frameWindow): void {
        try {
            setTimeout(function () {
                frameWindow.focus()
                try {
                    if (!frameWindow.document.execCommand('print', false, null)) {
                        frameWindow.print()
                    }
                } catch (e) {
                    frameWindow.print()
                }
                frameWindow.close()
            }, 10)
        } catch (err) {
            console.error(err)
        }
    },
    isDOM:
        typeof HTMLElement === 'object'
            ? function (obj) {
                  return obj instanceof HTMLElement
              }
            : function (obj) {
                  return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string'
              },
    /**
     * Set the height of the specified dom element by getting the existing height of the dom element and setting
     * @param {Array} arr
     */
    setDomHeight(arr) {
        if (arr && arr.length) {
            arr.forEach((name) => {
                const domArr = document.querySelectorAll(name)
                domArr.forEach((dom) => {
                    dom.style.height = dom.offsetHeight + 'px'
                })
            })
        }
    }
}

export default Print
